EN 2398:2008

Aerospace series - Heat resisting steel FE-PA2601 (X6NiCrTiMoV26-15) - Rm ≥ 900 MPa - Bars for machined bolts - D ≤ 25 mm

This standard specifies the requirements relating to:
Heat resisting steel FE-PA2601 (X6NiCrTiMoV26-15)
Rm ≥ 900 MPa
Bars for machined bolts
D ≤ 25 mm
for aerospace applications.

Luft- und Raumfahrt - Hochwarmfester Stahl FE-PA2601 (X6NiCrTiMoV26-15) - Rm ≥ 900 MPa - Stangen zur Spanabhebenden Formgebung für Schrauben - D ≤ 25 mm

Série aérospatiale - Acier résistant à chaud FE-PA2601 (X6NiCrTiMoV26-15) - Rm ≥ 900 MPa - Barres pour boulonnerie usinée D ≤ 25 mm

Aeronavtika - Toplotnoodporno jeklo FE-PA2601 (X6NiCrTiMoV26-15) - Rm = 900 MPa - Palice za strojno izdelane vijake - D = 25 mm

General Information

• Status: Published
• Publication Date: 25-Mar-2008
• Withdrawal Date: 29-Sep-2008
• ICS: 49.025.10 - Steels
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 4 - Metallic
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 21-Jan-2024
• Completion Date: 11-Feb-2026
• Ref Project: SIST EN 2398:2008 - Aerospace series - Heat resisting steel FE-PA2601 (X6NiCrTiMoV26-15) - Rm = 900 MPa - Bars for machined bolts - D = 25 mm

Relations

• Refers: EN 4258:2024 - Aerospace series - Metallic materials - General organization of standardization - Link between types of European Standards and their use
• Effective Date: 28-Jan-2026
• Refers: EN 2344:2001 - Aerospace series - Round bars, machined in heat resisting alloys - Diameter 10 mm < = D < = 180 mm - Dimensions
• Effective Date: 28-Jan-2026
• Refers: EN 2399:2008 - Aerospace series - Heat resisting steel FE-PA2601 (X4NiCrTiMoV26-15) - Rm ≥ 900 MPa - Bars for forged bolts - D ≤ 25 mm
• Effective Date: 28-Jan-2026
• Referred By: EN 3750:2010 - Aerospace series - Nuts, anchor, self-locking, fixed, 90° corner, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
• Effective Date: 28-Jan-2026
• Referred By: EN 3636:2008 - Aerospace series - Screws, reduced pan head, offset cruciform recess, relieved shank, long thread, in heat resisting steel FE-PA92HT (A286), silver plated - Classification: 900 MPa/650 °C
• Effective Date: 28-Jan-2026
• Referred By: EN 3768:2012 - Aerospace series - Nuts, anchor, self-locking, one lug, fixed, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 °C
• Effective Date: 28-Jan-2026
• Referred By: EN 2852:2010 - Aerospace series - Nuts, hexagonal, plain, normal height, normal across flats, heat resisting steel passivated - Classification: 1 100 MPa/650 °C
• Effective Date: 28-Jan-2026
• Referred By: EN 3538:2010 - Aerospace series - Nuts, anchor, self-locking, fixed, two lug, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature)/315 °C
• Effective Date: 28-Jan-2026
• Referred By: EN 2943:2024 - Aerospace series - Insert, MJ and M screw threads, helical coil - Technical specification
• Effective Date: 28-Jan-2026
• Referred By: EN 3435:2010 - Aerospace series - Nuts, anchor, self-locking, floating, two lug, reduced series, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
• Effective Date: 28-Jan-2026
• Referred By: EN 7010:2020 - Aerospace series - Configuration - Definition and designation for product standards for externally threaded fasteners
• Effective Date: 28-Jan-2026
• Referred By: EN 2867:2009 - Aerospace series - Nuts, anchor, self-locking, floating, one lug, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
• Effective Date: 28-Jan-2026
• Referred By: EN 2869:2009 - Aerospace series - Nuts, hexagonal, slotted/castellated, normal height, normal accross flats, in heat resisting steel, passivated - Classification: 1 100 MPa (at ambient temperature) / 650 °C
• Effective Date: 28-Jan-2026
• Referred By: EN 2868:2019 - Aerospace series - Nuts, hexagonal, slotted/castellated, normal height, normal across flats, in heat resisting steel, silver plated - Classification: 1 100 MPa (at ambient temperature)/650 °C
• Effective Date: 28-Jan-2026
• Referred By: EN 2863:2010 - Aerospace series - Nuts, anchor, self-locking, fixed, 90° corner, with counterbore, in heat resisting steel, MoS2 lubricated - Classification: 1 100 MPa (at ambient temperature) / 315 °C
• Effective Date: 28-Jan-2026

Overview

EN 2398:2008 is a European Standard developed by CEN within the aerospace series. It defines the requirements for heat resisting steel grade FE-PA2601 (X6NiCrTiMoV26-15) with a minimum tensile strength of 900 MPa, specifically for the production of bars used to machine aerospace bolts with diameters up to and including 25 mm. This standard ensures that metallic materials used in critical aerospace components meet stringent performance and quality criteria, contributing to safety and reliability in demanding environments.

Key Topics

• Material Specification: Defines the chemical and mechanical properties of FE-PA2601, a nickel-chromium titanium-molybdenum-vanadium alloy steel with heat resisting characteristics.
• Mechanical Properties: Emphasizes a minimum tensile strength (Rm) of ≥ 900 MPa, with specific criteria for elongation, reduction of area, and hardness.
• Dimensional Limits: Applicable only to bars with diameters at or below 25 mm for the fabrication of machined bolts.
• Heat Treatment Conditions: Outlines required delivery conditions such as softened, cold worked, solution treated, and optionally precipitation treated states to ensure optimal performance.
• Testing and Quality Assurance:
  • Testing Methods: Refers to EN 4700-2 for detailed requirements on test samples, dimensions, and inspection procedures.
  • Surface and Internal Defect Criteria: Relies on referenced standards for dye penetrant inspection, ultrasonic inspection, and micrographic cleanliness assessment.
• Marking and Traceability: Specifies marking and dimensional inspection requirements to support full component traceability throughout the supply chain.

Applications

EN 2398:2008 is essential for manufacturers and suppliers in the aerospace industry who produce or procure bars of heat resisting steel for the purpose of machining high-strength bolts and fasteners. Typical applications include:

• Airframe and Engine Bolts: Ensuring durability, strength, and resistance to heat and corrosion in structural and propulsion components.
• Critical Fasteners: Used in safety-critical assemblies in both civil and military aircraft.
• Machined Bolts: The prescribed steel grade and bar dimensions provide optimal machinability and performance under high thermal and mechanical loads.

This standard is also referenced during procurement, quality audits, and certification processes to ensure compliance with international aerospace material specifications.

Related Standards

EN 2398:2008 is closely associated with several other standards that address metallic materials for aerospace:

• EN 4700-2: Technical specification for steel and heat resisting alloys - wrought products - bars and sections.
• EN 2344: Defines requirements for round bars machined in heat resisting alloys within broader diameter ranges.
• EN 2399: Pertains to heat resisting steel bars for forged bolts.
• EN 4258: Offers a general organization of metallic material standards for aerospace applications.
• EN 2002-16: Specifies test methods for non-destructive penetrant testing.
• EN 4050-4: Provides ultrasonic inspection criteria for metallic materials used in aerospace.
• EN 2951: Method for determining non-metallic inclusions.

Practical Value

By adhering to EN 2398:2008, manufacturers and aerospace suppliers:

• Guarantee the mechanical integrity and reliability of machined bolts.
• Meet international aerospace material compliance requirements.
• Reduce risk and enhance traceability of critical fastener components.
• Support maintenance of performance in high-temperature, high-stress environments.

Choosing materials and processes aligned with EN 2398:2008 helps organizations meet both regulatory and market demands for safety, durability, and performance in aerospace fasteners.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Heat resisting steel FE-PA2601 (X6NiCrTiMoV26-15) - Rm = 900 MPa - Bars for machined bolts - D = 25 mmAeronavtika - Toplotnoodporno jeklo FE-PA2601 (X6NiCrTiMoV26-15) - Rm = 900 MPa - Palice za strojno izdelane vijake - D = 25 mmSérie aérospatiale - Acier résistant à chaud FE-PA2601 (X6NiCrTiMoV26-15) - Rm = 900 MPa - Barres pour boulonnerie usinée D = 25 mmLuft- und Raumfahrt - Hochwarmfester Stahl FE-PA2601 (X6NiCrTiMoV26-15) - Rm = 900 MPa - Stangen zur Spanabhebenden Formgebung für Schrauben - D = 25 mm49.025.10JeklaSteelsICS:SIST EN 2398:2008enTa slovenski standard je istoveten z:EN 2398:200801-junij-2008SIST EN 2398:2008SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 2398March 2008ICS 49.025.10 English VersionAerospace series - Heat resisting steel FE-PA2601(X6NiCrTiMoV26-15) - Rm = 900 MPa - Bars for machined bolts- D = 25 mmSérie aérospatiale - Acier résistant à chaud FE-PA2601(X6NiCrTiMoV26-15) - Rm = 900 MPa - Barres pourboulonnerie usinée D = 25 mmLuft- und Raumfahrt - Hochwarmfester Stahl FE-PA2601(X6NiCrTiMoV26-15) - Rm = 900 MPa - Stangen zurSpanabhebenden Formgebung für Schrauben - D = 25 mmThis European Standard was approved by CEN on 10 November 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 2398:2008: E
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